Hot-air furnace.



PATENTED AUG. 16, 1904.

F. WARNER. HOT AIR FURNACE.

APPLICATION FILED JULY 22. 1903,

2 SHEETS-SHEET 1 N0.MODEL.

r 54 wewfoz War PATBNTED AUG. 16, 1904.

F. WARNER. HOT AIR FURNACE.

APPLICATION FILED JULY 22, 1903.

2 SHEETS-SHEET 2-.

N0 MODEL.

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UNITED STATES Patented August 16, 1904.

PATENT OFFICE.

HOT-AIR FURNACE.

SPECIFICATION forming part of Letters Patent No. 767,614, dated August16, 1904.

- Application filed July 22, 1903. Serial No. 166,627. (No model.)

To all whom it may concern:

Be it known that I, FREDERICK WARNER, a citizen of theUnited States,residing at Gnadenhutten, in the county of Tuscarawas and State of Ohio,have invented a new and useful Hot- Air Furnace, of which the followingis a specification.

The invention relates to improvements in hot-air furnaces.

The object of the present invention is to improve the construction ofhot-air furnaces and to provide a simple and inexpensive one designedfor heating buildings and adapted to present a maximum amount of heatingand radiating surfaces and capable of affording a maximum amount of hotair at the expenditure of a minimum amount of fuel.

With these and other objects in view the invention consists in theconstruction and novel combination and arrangement of parts hereinafterfully described, illustrated in the accompanying drawings, and pointedout in the claims hereto appended, it being understood that variouschanges in the form, proportion, size, and minor details of constructionwithin the scope of the claims may be resorted to without departing fromthe spirit or sacrificing any of the advantages of the invention.

In the drawings, Figure 1 is a perspective View of a hot-air furnaceconstructed in accordance with this invention, a portion of the outercasing and the lining thereof being broken away to illustrate theconstruction of the hot-air drum or radiator. Fig. 2 is a centralvertical sectional view of the hot-air furnace. Fig. 3 is a horizontalsectional view of the same. Fig. 4 is a detail perspective view of thefire-pot. Fig. 5 is a similar view of the base of the hot-air furnace,illustrating the arrangement of the grate-bars.

Like numerals of reference designate corresponding parts in all thefigures of the drawings.

1 designates the base of the furnace, constituting the ash-pit andconsisting, preferably, ofa casting, as clearly illustrated in Fig. 5 ofthe drawings. The ash-pit is approximately rectangular in horizontalsection, and it has an extended front portion 2 arranged at the front ofthe furnace and provided with a door 3. The door 3,which is hinged,affords access to the ash-pit and is preferably provided with a suitabledamper 4 to assist in controlling the draft. The ash-pit is provided atthe top with a circular opening, and it has an annular seat 5,surrounding the same. A series of pivoted grate-bars 6 is arranged atthe opening at the top of the ash-pit, asclearly shown in Figs. 2 and 5,and these grate-bars, which are journaled in suitable bearings, areconnected by gears 7 and may be operated by any suitable means. Thegrate-bars are preferably removable by being inverted and forced inwardto disengage their front ends, and they are then dropped downward anddrawn outward to disengage their rear ends and to remove them. The rearbearings of the gratebars are made sufficiently large to permit thisoperation.

Mounted upon the ash-pit is a downwardlytapered fire-pot 8, and arrangedupon the upper edge of the latter is a ring forming a cappiece 9,provided at intervals with supporting-lugs 10, which space the ring fromthe upper edge of the fire-pot and provide an annular air-passage. Theair-passage through the space or passage between the upper edge of thefire-pot and the ring 9 is to support combustion, and air may also beadmitted at the base of the fire-pot througlr the apertures of the door3. The ring, which presents an inwardly-inclined outer face, has adepending inner inclined flange 11, which extends downward within thefire-pot to a point below the upper edge of the said firepot. The upperedge of the ring fits against the inner face of the cylindrical portionof a heating-drum or radiator 12, which is fitted upon the ash-pit in anannular groove '13 of the circular or annular seat 5. The heatingdrum orradiator 12 consists of the said cylindrical body portion and ahorizontal top 14, and the ring 9, which fits against the interior ofthe body portion of the heating-drum or radiator, closes the space atthe top of the fire-pot and causes the air to pass downward and inwardthrough the intervening space between the upper edge of the fire-pot andthe superimposed ring.

The hot-air drum or radiator extends from the top of the ash-pit, andthe body portion consists of a single piece of sheet metal, as clearlyillustrated in Fig. 2 of the drawings, and it thereby dispenses withcement joints and the like, and there is no liability of the escape ofcoal-gas. The top of the heatingdrum or radiator will in practice besecurely riveted to the cylindrical body portion. The heating-d rum orradiator is provided with an annular series of flues formed by asheet-metal jacket 15 and an annular series of upright approximately\I-shaped partitions 16, arranged as shown in Fig. 3 and interposedbetween the body portion of the heating-drum or radiator and the jacket15 and supporting the latter. These upright partitions besides formingthe annular series of flues serve to conduct the heat to the outerjacket, which also operates to heat the air within an outer casing 17.The outer casing, which consists of a cylindrical body portion and aconnecting top 18, is provided with an inner cylindrical lining 19,which may be supported in any desired manner and which prevents the heatfrom being radiated from the furnace and which also formsradiating-surfaces for heating the air within the outer casing.

The furnace is provided at the front above the ash-pit with a horizontaldraft tube or flue 20, preferably rectangular in cross-section, and

- provided at the front with an exteriorly-arranged door 21. The door 21is provided with suitable apertures, and it has a pivoted plate ordamper for controlling the draft through the same, and it may be openedto increase the draft. Air enters the horizontal draft tube or flue 20and passes into the annular space surrounding the fire-pot and becomesheated. It then passes over the upper edge of the fire-pot and entersthe latter, and by this arrangement a positive draft is effected, andthe combustion may be readily controlled. An inclined tubular chute 22is arranged above the draft tube or flue 20 for enabling the furnace tobe supplied with fuel. The fuel-chute 22 is provided at its outer endwith a door 23, having suitable means for controlling the draft. Thedraft tube or flue and the fuelchute pierce the outer casing, thecylindrical lining thereof, and the adjacent side of the radiator, asclearly shown in Fig. 2.

The heating-drum or radiator is provided with a central flanged aperture2 1, which receives a smoke-pipe 25, and the latter extends rearwardover the top of the radiator and downward between the same and thelining of the outer casing. The smoke-pipe pierces the lining or casingat a point below the top of the radiating or heating drum and isprovided at the exterior of the casing with a suitable damper or cut-off26. The top-of the outer casing is provided with hot-air-supply pipes27, which are designed to extend to the apartments or rooms to beheated.

Cold air may be admitted to the space between the radiator and the outercasing by any suitable means, as will be readily understood. The casingor lining, which is concentric with the cylindrical portion of the outercasing, is spaced from the same and terminates short of the top andbottom thereof. The jacket 15, which is concentric with the body portionof the drum, terminates short of the top and bottom of the same.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. In a furnace of the class described, the combination of a fire-pot, abody spaced from and surrounding the fire-pot, and a superimposedcap-piece fitted against the body and provided with lugs resting againstthe firepot, said cap-piece being also provided with a depending flangefitting within and extending below the fire-pot and spaced therefrom,substantially as described.

2. In a furnace. of the class described, the combination of ataperedfire-pot, acylindrical body spaced from and surrounding the firepot, anda superimposed ring fitted against the body and provided with lugsresting upon the fire-pot, said ring being also provided with a flangefitting within and depending be low the upper edge of the fire-pot andspaced therefrom, substantially as described.

3. In a furnace, the combination of a casing, a fire-pot, a combinedheating-drum and radiator comprising a body portion surrounding thefire-pot and spaced therefrom to form an interspace, the lattercommunicating with the interior of the fire-pot, a jacket surroundingthe body and spaced therefrom, the space being provided with a series offines, and a top closing the upper end of the body and terminating shortof the flues, and a flue piercing the combined drum and radiator andcommunicating with the space between the same and the fire-pot and withthe exterior of the furnace, substantially as described.

4. In a furnace of the class described, the combination of an ash-pitprovided with an annular seat, a fire-pot mounted upon the ashpit, acombined heating-drum and radiator closed at the top and mounted on theannular seat of the ash-pit and having a projecting series of uprightfiues, a ring mounted within the combined drum and radiator and fittedagainst the same and spaced from the upper edge of the fire-pot, anouter casing having an inner lining, and a draft tube or flue piercingthe outer casing, the lining, and the combined heating-drum and radiatorand communicating with the space surrounding the fire-pot, substantiallyas described.

5. In a furnace of the class described, the combination of an ash-pitprovided with an annular seat and having an annular groove concentricwith the said seat, a fire-pot supported by the said seat, a combineddrum and interposed between the said outer casing and the combined drumand radiator and extending from the top to the bottom of the latter,substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

FREDERICK WARNER.

Witnesses:

WILLIAM WARNER, FRANK WOLFE.

